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1. A 480-V 400-kVA 0.85-PF-lagging 50-Hz four-pole Δ-connected generator is driven by a 500-hp diesel engine and is used as a standby or emergency generator. This machine can also be paralleled with the normal power supply (a very large power system) if desired.
(a) What are the conditions required for paralleling the emergency generator with the existing power system? What is the generator's rate of shaft rotation after paralleling occurs?
(b) If the generator is connected to the power system and is initially floating on the line, sketch the resulting magnetic fields and phasor diagram.
(c) The governor setting on the diesel is now increased. Show both by means of house diagrams and by means of phasor diagrams what happens to the generator. How much reactive power does the generator supply now?
(d) With the diesel generator now supplying real power to the power system, what happens to the generator as its field current is increased and decreased? Show this behavior both with phasor diagrams and with house diagrams.
A finite state recognizer or sequence detector has one input (X) and one output (Z). The output is asserted high (Z=1) whenever the input sequence 1101 has been observed during the past four clock cycles, as long as 1110 has never been observed.
A line charge of infinite lenght lies along the z axis and carries a uniform linear charge density of ρl C/m. A perfectly conducting cylindrical shell, whose axis is the z axis, surrounds the line charge.
How does a colpitts oscillator works an also explain the principle
For each of the following systems with input x(t) and output y(t), state whether or not the system is (i) Linear and (ii) Time Invariant. Note that x(t) could be any complex valued signal. (a) y(t) = a^2 x(t), where a is a complex number.
A cellular operator using the FDMA technique is allocated a total spectrum of 25 MHz. The system has a channel bandwidth of 60 kHz. It also uses a guard band of 20 kHz. Compute the number of channels that can be simultaneously supported in this wi..
A 1.80kg , horizontal, uniform tray is attached to a vertical ideal spring of force constant 195N/m and a 290g metal ball is in the tray. The spring is below the tray, so it can oscillate up-and-down.
Shortest distance between two points. LetP1=(x1,y1) andP2=(x2,y2) be two given points.Find the third point P3(x3,y3)such that d1=d2 is minimized, whered1 is the distance from P3 to P1and d2 is the distance from P3 toP2.
A uniform magnetic field is applied perpendicular to the plane of a 60-turn circular coil with a radius of 6.0 cm and a resistance of 0.60 ohms. If the magnetic field increases uniformly from 0.20 T to 1.8 T in 0.20 s
What are the two possible frequencies to which the local oscillator could be set? What bandwidth should the 10.7 MHz IF amplifier have?
A car battery with a 14.2 V emf and aninternal resistance of 0.0380 is beingcharged with a current of 51.5 A. (a) What is the potential difference across its terminals
Modify the state diagram branching conditions in the diagrams below as needed to ensure the sum and exclusion rules are obeyed in each case.
With the multi function gate: F = X'AB + YA'B + X'AB + YAB' 1. Can this gate be used as an inverter If yes, how 2. Will the change in the number of inputs or outputs affect the number of operation select lines Explain.
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